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Let N = 35711171923293137..., the concatenation of the odd primes. a(n) is the n-digit number formed from the digits of N starting from the {n(n-1)/2 +1}th digit. Omit any leading zeros.
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%I #1 Sep 29 2006 03:00:00

%S 3,57,111,3171,92329,313741,4347535,96167717,379838997,1011031071,

%T 9113127131,137139149151,1571631671731,79181191193197,199211223227229,

%U 2332392412512572,63269271277281283,293307311313317331

%N Let N = 35711171923293137..., the concatenation of the odd primes. a(n) is the n-digit number formed from the digits of N starting from the {n(n-1)/2 +1}th digit. Omit any leading zeros.

%H Paul Cooijmans, <a href="http://web.archive.org/web/20050302174449/http://members.chello.nl/p.cooijmans/gliaweb/tests/odds.html">Odds</a>.

%Y Cf. A066549.

%K base,nonn

%O 1,1

%A Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 19 2006